package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.Shop;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private RedisTemplate redisTemplate;
    @Override
    public Result queryAllShopType() {
        //1. 从redis中查询商铺类型缓存
        List shopList = redisTemplate.opsForList().range(RedisConstants.CACHE_SHOPTYPE_KEY, 0, -1);
        //2.判断是否存在
        if(shopList.size() != 0){
            //3.存在直接返回
            return Result.ok(shopList);
        }
        //4.不存在，查询数据库
        List<ShopType> list = query().list();
        //5.数据库中不存在，返回错误信息
        if(list.size() == 0){
            return Result.fail("查询失败，商户不存在");
        }
        //6.数据库中存在，写入redis
        list = list.stream().sorted(Comparator.comparing(ShopType::getSort).reversed()).collect(Collectors.toList());
        redisTemplate.opsForList().leftPushAll(RedisConstants.CACHE_SHOPTYPE_KEY,list);
        //7.返回
        return Result.ok(list);
    }
}
